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Jan. 3,' 192& 1,654,738

J. A. KRANTZ LOCK JOINT FOR METAL PIPES Filed April 16. 1927 ummum Patented Jan. 3, 19 5 UNITED STATES 1,654,738 PATENT OFFICE.

JOSEPH A. KBANTZ, OF: DOVER, OHIO, .A SSIGNOB TO THE REEVES MUFAOTUBING mm, OF DOVER, OHIO, A CORPORATION OF OHIO.

LOCK JOINT FOB HETAL PIPES.

Application filed April 18,

The invention relates to sheet metal pipes such as stovepipes and 'the ,like and more particularly to a lock joint for such. plpes.

Lock joints of various kinds have been made in the past for pipes of this kind, but there are various objections to Such joints as are now in use as thev 'not only reuire considerable metal for the forming of t e joint but frequently necessitate apertures' or slits in the outer surface of the joint which not only detract from the appearance of the pipe but leave sharp protruding edges of the metal, making the same dangerous to handle.

The object of the present invent on 18 to provide a lock joint for a Stovepipe or the like in which a minimum amount of metal is required vfor the formation of the joint, and in which the exterior of the p pe is smooth and unbroken and the exterior of the joint is flush.

An embodiment of the invention s illustrated in the-' accompanying drawing, in which- Figure 1 is a perspective view of a section of stovepipe provided with the improved lock joint;

Fig. 2, a transverse sectional view throu h the stovepipe, showing the jo nt before 0- sure; 4

Fig. 3, a transverse section throu h the stove ipe, showing the joint 01 and locke and Fig; 4, a fragmentary sectional view of a modified -form of the joint.

Similar numerals to similar parts throu bout the drawing. I

It s ould be understood that in the manufacture of Stovepipe and the like, it is desirable to provide a joint 'whlch may be easily and readily closed without the use oftools or machinery, thus-permitting the sections of pipe to be shipped in open or r unlocked position,- permitting nestmgpf the 45 pipe sections in order to conserve shipping space. i

A section of stovepipe in indicated generally at 1, bei .formed of sheet metal and having one en reduced and cnmped as at 2 inorder to be inserted into the normal end 3 of a similar section.

In -forming the roved oint, one

10 'tudinal edge or the $1118 sectlon 1s fol ed back upon itself as own at 4 upon in igs. 1' and 3, hol

1927. Serial No. 184,313.

the interior of the pipe and then folded in the reverse direction as shown at 5, sub- 7 stantially parallel to the portion 4, and forming the groove 6.

The flange 5 extends slightly beyond the folded edge 7 and terminates in an an lar rearwardly disposed hooked locking shoulder 8 which may be strengthened by the angular flange ,9. v

The opposite edge of the ipe section is bent inwardly and rearward l forming a hooked locking shoulder 10, terminating in the outwardly inclined angular flange 11 which may be substantially the width of the groove 6.

The pipesections are formed in this manncr at the shop and may be nested 'for shipping, there being sufiicient resilience in the sheet metal of which the ipe sections are formed to permita consi erable number of sections to be laced one within the other in this open con ition.

When it is desired to close the joint of a section, it is only necessary to insert the an gular flange 11 into the groove 6 and ress the edges of the section together, the odeing shoulder 10 hookin over and interlocks in with the lockin s oulder 8 as shown ing the joint locked in closed position.

When the joint is once looked, it will be a seen that cannot accidentally open and any pull upon opposite sides ofthe section will only tend flto pull the shoulder .10 more tightly against the shoulder 8-, holding the same in interlocked condition. A slight modificatiomof the joint is shown in Fig. 4, in which the flange 5 and groove 6 are shortened, the shoulder- 8 being formed inside of the folded edge 7. In this form of the joint the flange 9 may be of ter width than shown in the referred orm in order to extend beyond t folded edge 7' to assist in inserting the flange 11 of the other edge of the section. This flange 11' will, of course, benarrower than shown in F 1 to 3 in order to fit within the narrow groove 6.

From the abovedescription and an ins 0 tion of the accompanying drawin it be seen that a. v simple'and e cient lock 10 joint is rovi ed in which a minimum amount 0 metal is used for the formation of the joint; in which the exterior of the pipe section is flush at the joint; and in which the joint is easily and readily closed and locked against opening.

I claim:

1. A pipe section comprising a metallic sheet, one margin of which is folded flat against the inside of the sheet and then re folded to form a flange spaced from the first named fold and defining av ove, said flange terminating in a rearwa ly'disposed hooked locking shoulder, the other margin of the sheet being insertable into said groove and having a rearwardly disposed hooked locking shoulder for locking engagement with the first named locking shoulder.

2. A pipe sectioncomprising a metallic sheet, one margin of which is folded flat against the inside of the sheet and then refolded'to form a flange spaced from the first named fold and defining a ve, said flange terminating beyond the folded edge in a rearwardly disposed hooked locking shoulder, the other margin of the sheet being lnsertable into said groove and having a T rearwardly disposed hooked locking shoulder for lockingengagement with the first named locking shoulder. a p

3. pipe section comprising a metallic folded to form" a flan sheet, one margin of which is folded flat against the inside of the sheet and then respaoed from the first named fold and de g a oove, said flange terminati in a rearwar ly disposed hooked locking s oulder havin anangular reinforcing flange at its outer e go, the other margin of the sheet being insertable into said groove and having a rearwardly disposed hooked lo'cking shoulder for locking enga ement with the first, named locking shoul er.

4. A pipe sectioncomprising a metallic sheet, one margin of which is folded flat against the inside of the sheet and then refolded to form a I spaced from the first named fold and de ing a groove, said flange terminating beyond the folded edge in a real'wardly disposed hooked locking shoulder having an angular reinforcing flange at its outer edge, the other margin of the sheet being insertable into said groove and having a rearwardly disposed hooked locking shoulder for locking engagement with the first named locki shoulder.

In testimony that-I claim the above, I have hereunto subscribed my name.

JOSEPH A. KRANTZ.

pipe section is flush at the joint; and in which the joint is easily and readily closed and locked against opening.

I claim:

1. A pipe section comprising a metallic sheet, one margin of which is folded flat against the inside of the sheet and 'then re folded to form a flange spaced from the first named fold and defining a ove, said flange terminating in a rearwar ly'disposed hooked locking shoulder, the other margin of the sheet being insertable into said groove and having a rearwardly disposed hooked locking shoulder for locking engagement with the first named locking shoulder.

2. A pipe section. comprising a metallic sheet, one margin of which is folded flat against the inside of the sheet and then refolded to form a flange spaced from the first named fold and defining a groove, said flange terminating beyond the folded edge in a rearwardly disposed hooked locking shoulder, the other margin of the sheet being insertable into said groove and having a rearwardly disposed hooked locking shoulder for locking engagement with the first named locking shoulder.

3. A pipe section comprising a metallic DiscLA iwER lock joints for metal dated January 3, 1928.

Hereby all sheet, one margin of which is folded flat against the inside of the sheet and then refolded to form a flan spaced from the first named fold and de ning a groove, said flange terminatin in a rearwardly disposed hooked locking 5 oulder having an angular reinforcing flange at its outer edge, the other margin of the sheet being insertable into said groove and having a rearwardly disposed hooked locking shoulder for locking enga ement with the first named locking shoul er.

4. A pipe section comprising a metallic sheet, one margin of which is folded flat against the inside of the sheet and then refolded to form a flange spaced from the first named foldand defining a groove, said flange terminating beyond the folded edge in a rearwardly disposed hooked locking shoulder having an angular reinforcing flange at its outer edge, the other margin of the sheet being insertable into said groove and having a rearwardly disposed hooked locking shoulder for. locking engagement with thefirst named lockingshoulder.

In testimony that I claim the above, I have hereunto subscribed my name.

JOSEPH A. KRANTZ.

Loci: Jonw'r ron Mau Pius. Patent 29, 1931, by the of the character described in claims 1, 2, 3, and 4, of said Letters Patent; except those wherein the hooked I shoulders defined in each-0t said claim are located within the cylindrie periph wall of the pipe and the exterior of the pipe is smoothand unbroken and the exterior of the joint is flush.

[Ofinial Gazette November 17, 1931.]

All

DISCLAIMER 1,654,738.Joseph A. Kramz, Dover, Ohio. Locx JOINT FOB METAL PIPES. Patent dated January 3/1928. Disclaimer filed October 29, 1931, by the The Reeves Manufacturing Company.

Hereby disclaims all look joints for metal pipes of the character described in claims 1, 2, 3, and 4 of said Letters Patent; except those wherein the hooked lockifi shoulders defined in each-oil said claims are located within the cylindric periphe Wall of the pipe and the exterior of the pipe is smooth and unbroken and the exterior of the joint is flush.'

[Qflicial Ghzette November 17, 1931.] 

